removing volume group and mirroring disk

[Cathy Arora]

Hi all;
I have to completely remove the whole volume group and mirror my 2nd disk instead.
i would like to know all the logical steps that I need to take.

I appreciate your help;

Thanks,

[A. Clay Stephenson]

First of all, mirrors are not done at the disk level but rather at the logical volume (LVOL) level.

By far the easist method for removing a VG, is the vgexport command.
e.g.
vgexport /dev/vg02

Now let's say that you are going to mirror lvol1 and lvol2 on vg01. Your new disk is /dev/dsk/c1t5d0.

1) pvcreate -f /dev/rdsk/c1t5d0.
2) vgextend /dev/vg01 /dev/dsk/c1t5d0
3) lvextend -m 1 /dev/vg01/lvol1 /dev/dsk/c1t5d0
lvextend -m 1 /dev/vg01/lvol2 /dev/dsk/c1t5d0

man vgexport,pvcreate,vgextend,lvextend for details.

[Michael Tully]

I'm assuming here, that you wish to mirror the logical volumes for your LV's on the disk that has vg00
Clay is quite correct, mirrors are done at the LV level.

# vgexport /dev/vg02
# pvcreate -Bf /dev/rdsk/xyz
# vgextend /dev/vg00 /dev/dsk/xyz
# mkboot /dev/rdsk/xyz
# mkboot -a "hpux -lq (;0) /stand/vmunix" /dev/rdsk/xyz
# lvextend -m 1 (with every lv on the vg )
# lvlnboot -R
# vgvcfgbackup /dev/vg00

or for an easy script method you can use this for the lvextend for LV's if they are all named lv....

# for i in /dev/vg00/lv*
> do
> echo $i
> lvextend -m 1 $i
> done

[Cathy Arora]

Thanks.
I will have unmount remove the entries from fstab before vgexport.
is there anything else I need to do before vgexport?
I understand all the steps were mentioned in mirroring process except mkboot -l and mkboot -a.
could you please explain?
I was implying to mirror all the logical volume of vg00 to my 2nd disk.sorry about the confusion.
so system can be booted from 2nd disk if needed.

[Lorenzo Facello]

Hi,
you use commands
mkboot /dev/dsk/cxtxdx
mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/dsk/cxtxdx

to make bootable the disk you have to mirror
these comm make a cp of the LIF area, BDRA, VGRA

remember to use also at first
pvcreate -Bf /dev/dsk/cxtxdx
f=force
B=to be bootable

Hope this helps
L.

[Elmar P. Kolkman]

Before starting to try to mirror (and destroy the old VG), make sure MIRROR UX is installed on your system ('swlist | grep -i mirror' should show it). If not, your whole action will be useless, because mirroring won't be possible...

[Cathy Arora]

Thanks all
I am having problem with ISL screen on console.
it is not very intuitive. how do i change the path for alternate disk.
PRI alt "whole path"